Since you collecting not just bitcoins but multiple coins. What the proper way to do most especially if the coins are falling is to buy more of that coins in dip and keep holding on the other coins and wait for the peak before you let of it. Or just do a long term investment especially on bitcoins because that is a very promising coins in the future.
That's true, create a strategy like don't put the whole money you have at one place, put a little amount of money as a backup in case the price get dropped and you executes it to keep buying until it get recovered, so you would make another profit even there's a huge drop.